Question

Give scientific reasons. A condenser had two taps.

Answer 1

The purpose of a lab condenser is to expose hot vapor to water, which has a high heat capacity and so cools the vapor efficiently. 
You need the water to be flowing, but you also need it to be present.
Filling the condenser from the top means that less water is present.

Answer 2

he purpose of a lab condenser is to expose hot vapor to water, which has a high heat capacity and so cools the vapor efficiently.You need the water to be flowing, but you also need it to be present.Filling the condenser from the top means that less water is present.hope it helps!